9NCE | pdb_00009nce

Oxidized Treponema pallidum thioredoxin strain Nichols

PDB DOI: https://doi.org/10.2210/pdb9NCE/pdb

Classification: STRUCTURAL PROTEIN
Organism(s): Treponema pallidum subsp. pallidum str. Nichols
Expression System: Escherichia coli BL21(DE3)
Mutation(s): No

Deposited: 2025-02-16 Released: 2026-02-11
Deposition Author(s): Carbone, V., Ronimus, R.S., Sutherland-Smith, A.J.
Funding Organization(s): Not funded

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.96 Å
R-Value Free:
0.256 (Depositor), 0.267 (DCC)
R-Value Work:
0.200 (Depositor), 0.216 (DCC)
R-Value Observed:
0.203 (Depositor)

Starting Model: experimental
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Literature

Structural examination of thioredoxin and thioredoxin reductase from the syphilis organism Treponema pallidum with Mapharsen, the active ingredient of the original magic bullet (Salvarsan).

Carbone, V., Ronimus, R.S.

To be published.

Macromolecule Content

Total Structure Weight: 15.55 kDa
Atom Count: 831
Modeled Residue Count: 104
Deposited Residue Count: 141
Unique protein chains: 1

Macromolecules

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Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Thioredoxin	A	141	Treponema pallidum subsp. pallidum str. Nichols	Mutation(s): 0 Gene Names: trxA, TP_0919
UniProt
Find proteins for O83889 (Treponema pallidum (strain Nichols)) Explore O83889 Go to UniProtKB: O83889
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	O83889
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
PO4 Query on PO4 Download:Ideal Coordinates CCD File SDF format, chain B [auth A] MOL2 format, chain B [auth A] mmCIF format, chain B [auth A]	B [auth A]	PHOSPHATE ION O₄ P NBIIXXVUZAFLBC-UHFFFAOYSA-K		Interactions Focus chain B [auth A] Interactions & Density Focus chain B [auth A]
CL Query on CL Download:Ideal Coordinates CCD File SDF format, chain C [auth A] MOL2 format, chain C [auth A] mmCIF format, chain C [auth A]	C [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M		Interactions Focus chain C [auth A] Interactions & Density Focus chain C [auth A]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 1.96 Å
R-Value Free: 0.256 (Depositor), 0.267 (DCC)
R-Value Work: 0.200 (Depositor), 0.216 (DCC)
R-Value Observed: 0.203 (Depositor)

Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 89.82	α = 90
b = 89.82	β = 90
c = 33.89	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
Aimless	data scaling
MOSFLM	data reduction
PHASER	phasing

Structure Validation

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Entry History

& Funding Information

Deposition Data

Released Date: 2026-02-11

Deposition Author(s):

Sutherland-Smith, A.J.

Funding Organization	Location	Grant Number
Not funded		--

Revision History (Full details and data files)

Version 1.0: 2026-02-11
Type: Initial release

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.